Communication method, apparatus, and system

Abstract

A method includes a first access network device that sends first indication information to a second access network device. The first indication information indicates information about a current active BWP and/or transmission rate information of a terminal device on the first access network device. The second access network device determines information about a first-time active BWP and/or BWP configuration information of the terminal device on the second access network device based on the first indication information. The method may be used to enable the second access network device to determine the appropriate information about the first-time active BWP and/or the appropriate BWP configuration information of the terminal device on the second access network device. In this way, service interruption caused by switching of an active BWP is reduced, and/or service interruption caused by changing of a BWP configuration is reduced.

What is claimed is: 
     
       1. A communication method, wherein the method comprises:
 receiving, by a second access network device, a first message from a first access network device, wherein the first message comprises first indication information, and the first indication information indicates information about a current active bandwidth part (BWP) of a terminal device on the first access network device and/orand transmission rate information of the terminal device on the first access network device, and wherein the information about the current active BWP comprises information about a current active downlink BWP and information about a current active uplink BWP; and 
 determining, by the second access network device, first configuration information of the terminal device on the second access network device based on the first indication information. 
 
     
     
       2. The method according to  claim 1 , wherein
 the transmission rate information comprises at least one of uplink transmission rate information or downlink transmission rate information. 
 
     
     
       3. The method according to  claim 1 , further comprising:
 sending, by the second access network device, a second message to the first access network device, wherein the second message comprises the first configuration information, wherein the first message is a handover request message, and the second message is a handover request acknowledgment message; or the first message is a handover preparation information message, and the second message is a handover command message. 
 
     
     
       4. The method according to  claim 1 , wherein before the receiving, by the second access network device, the first message from the first access network device, the method further comprises:
 sending, by the second access network device, a third message to the first access network device, wherein the third message is used to request to obtain context information of the terminal device, wherein the third message is a retrieve UE context request message, and the first message is a retrieve UE context response message. 
 
     
     
       5. The method according to  claim 1 , wherein
 the first configuration information comprises at least one of information about a first-time active BWP or BWP configuration information. 
 
     
     
       6. The method according to  claim 5 , wherein the determining, by the second access network device, first configuration information of the terminal device on the second access network device based on the first indication information comprises:
 determining, by the second access network device, the information about the first-time active BWP or the BWP configuration information that matches bandwidth information of the current active BWP or the transmission rate information. 
 
     
     
       7. A communication method, wherein the method comprises:
 generating, by a first access network device, a first message, wherein the first message comprises first indication information, and the first indication information indicates information about a current active bandwidth part (BWP) of a terminal device on the first access network device and transmission rate information of the terminal device on the first access network device, and wherein the information about the current active BWP comprises information about a current active downlink BWP and information about a current active uplink BWP; and 
 sending, by the first access network device, the first message to a second access network device. 
 
     
     
       8. The method according to  claim 7 , wherein
 the transmission rate information comprises at least one of uplink transmission rate information or downlink transmission rate information. 
 
     
     
       9. The method according to  claim 7 , further comprising:
 receiving, by the first access network device, a second message from the second access network device, wherein the second message comprises first configuration information of the terminal device on the second access network device, and the first configuration information is determined based on the first indication information; and 
 sending, by the first access network device, the first configuration information to the terminal device, wherein the first message is a handover request message, and the second message is a handover request acknowledgment message; or the first message is a handover preparation information message, and the second message is a handover command message. 
 
     
     
       10. The method according to  claim 9 , wherein
 the first configuration information comprises at least one of information about a first-time active BWP or BWP configuration information. 
 
     
     
       11. The method according to  claim 7 , wherein before the generating, by the first access network device, the first message, the method further comprises:
 receiving, by the first access network device, a third message from the second access network device, wherein the third message is used to request to obtain context information of the terminal device. 
 
     
     
       12. The method according to  claim 11 , wherein
 the third message is a retrieve UE context request message, and the first message is a retrieve UE context response message. 
 
     
     
       13. A communication apparatus, comprising:
 a memory; and
 a processor, that is operatively coupled to the memory, to: 
 receive a first message from a first access network device, wherein the first message comprises first indication information, and the first indication information indicates information about a current active bandwidth part (BWP) of a terminal device on the first access network device and transmission rate information of the terminal device on the first access network device, and wherein the information about the current active BWP comprises information about a current active downlink BWP and information about a current active uplink BWP; and 
 determine first configuration information of the terminal device on a second access network device based on the first indication information. 
 
 
     
     
       14. The communication apparatus according to  claim 13 , wherein
 the transmission rate information comprises at least one of uplink transmission rate information or downlink transmission rate information. 
 
     
     
       15. The communication apparatus according to  claim 13 , wherein the processor is further to:
 send a second message to the first access network device, wherein the second message comprises the first configuration information. 
 
     
     
       16. The communication apparatus according to  claim 13 , wherein the processor is further to:
 send a third message to the first access network device before receiving the first message from the first access network device, wherein the third message is used to request to obtain context information of the terminal device. 
 
     
     
       17. The apparatus according to  claim 16 , wherein
 the third message is a retrieve UE context request message, and the first message is a retrieve UE context response message.